Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Optics

Gain-assisted plasmon induced transparency in T-shaped metamaterials for slow light

Jinna He, Junqiao Wang, Pei Ding, Chunzhen Fan, Erjun Liang

Published Apr 9, 2015• 20 citations
Publisher

Abstract

We theoretically investigate the gain-assisted plasmonic analog of electromagnetically induced transparency (EIT) in a novel planar metamaterial, whose unit cell consists of two perpendicularly connected metallic bars, forming a 'T' configuration. An EIT-like resonance can be achieved by introducing symmetry breaking into its shape. The results show that the group index is greatly enhanced at the optimum value of the gain due to a dramatic amplification of the EIT-like resonance. Furthermore, a trade-off between the group index and the transmittance at the EIT-like resonance, which always exists in passive systems with no gains, can be removed at an approximate gain level. E-field enhancements are used to understand the underlying physics.

DOI
10.1088/2040-8978/17/5/055002

Related papers

Polarization-Independent Plasmon-Induced Transparency in a Symmetric Metamaterial

Sang‐Eun Mun, Kyookeun Lee, Hansik Yun +1 more

We propose a novel mechanism for generating electromagnetically induced transparency (EIT) in a symmetric metamaterial. The proposed metamaterial consists of double nanorod pairs, perpendicular to each other in the form of a 2-by-2 matrix. This metamaterial shows a polarization-independent EIT-like effect without breaking its symmetry. Since conventional plasmonic EIT metamaterials induce transparency in the transparent window through the coupling between the localized surface plasmon resonance modes, most of existing structures have asymmetric geometry. This limitation means the EIT-like effect can occur only under a particular linearly polarized incident light. The proposed structure, however, has a simple geometry and polarization independence, so it has the potential to be used in high sensitivity sensors and to slow light in the visible spectral range.

IEEE Photonics Technology Letters•Sep 2, 2016•19 citations

Tunable plasmonically induced transparency with giant group delay in gain-assisted graphene metamaterials

Yi Zeng, Zi-xiao Ling, Gui-Dong Liu +2 more

We propose a graphene metamaterial consisting of several layers of longitudinally separated graphene nanoribbon array embedded into gain-assisted medium, demonstrating electromagnetically induced transparency-like spectra. Combined with finite-difference time-domain simulations, the transfer matrix method and temporal coupled-mode theory are adopted to quantitatively describe its transmission characteristics. These transmission characteristics can be tuned by altering the gain level in medium layer and the Fermi energy level in graphene. Additionally, it is the incorporation between gain medium and graphene nanoribbons with optimized geometrical parameters and Fermi energy level that the destructive interference between high order graphene plasmonic modes can be obtained, suggesting drastic phase transition with giant group delay and ultra-high group index up to 180 ps and 104, respectively. Our results can achieve efficient slow light effects for better optical buffers and other nonlinear applications.

Optics Express•Apr 5, 2022•57 citations

Large group delay in a microwave metamaterial analog of electromagnetically induced transparency

Lei Zhang, Philippe Tassin, Thomas Koschny +3 more

We report on our experimental work concerning a planar metamaterial exhibiting classical electromagnetically induced transparency (EIT). Using a structure with two mirrored split-ring resonators as the dark element and a cut wire as the radiative element, we demonstrate that an EIT-like resonance can be achieved without breaking the symmetry of the structure. The mirror symmetry of the metamaterial’s structural element results in a selection rule inhibiting magnetic dipole radiation for the dark element, and the increased quality factor leads to low absorption (<10%) and large group index (of the order of 30).

arXiv:1010.2976•Applied Physics Letters•Dec 13, 2010•166 citations

The metamaterial analogue of electromagnetically induced transparency by dual-mode excitation of a symmetric resonator

邵健, Li Jie, 李家奇 +4 more

Electromagnetically induced transparency(EIT) is obtained in a symmetric U-shaped metamaterial,which is attributed to the simultaneously excited dual modes in a single resonator under lateral incidence.A large group index accompanied with a sharp EIT-like transparency window offers potential applications for slowing down light and sensing.

中国物理B：英文版•Jan 1, 2013•0 citations

The metamaterial analogue of electromagnetically induced transparency by dual-mode excitation of a symmetric resonator

Jian Shao, Jie Li, Jia-Qi Li +4 more

Electromagnetically induced transparency (EIT) is obtained in a symmetric U-shaped metamaterial, which is attributed to the simultaneously excited dual modes in a single resonator under lateral incidence. A large group index accompanied with a sharp EIT-like transparency window offers potential applications for slowing down light and sensing.

Chinese Physics B•Oct 1, 2013•4 citations

Electromagnetically Induced Transparency in All-Dielectric U-Shaped Silicon Metamaterials

Mengyao Qin, Chengda Pan, Yu Chen +4 more

An analogy of electromagnetically induced transparency (EIT) based on all-dielectric metamaterial is theoretically demonstrated in this paper. The U-shaped Silicon-based metamaterial unit cell comprises a dipole antenna supported by one horizontal nanoscale bar and a quadrupolar antenna supported by two vertical nanoscale bars. The near-field coupling between the two antennas and the reduction of absorption loss lead to a narrow EIT-like transmission window with a high quality-factor of 130, which exhibits a refractive index sensitivity with a figure-of-merit of 29. The group delay of 0.75 ps and the group index of 2035 are obtained in the transmission window. Due to these unique optical properties, the proposed metamaterial structure can find many applications including slow-light devices, optical sensors, enhancement of non-linear processes, and storage of quantum information.

Applied Sciences•Oct 1, 2018•45 citations
We theoretically investigate the gain-assisted plasmonic analog of electromagnetically induced transparency (EIT) in a novel planar metamaterial, whose unit cell consists of two perpendicularly connected metallic bars, forming a 'T' configuration. An EIT-like resonance can be achieved by introducing symmetry breaking into its shape. The results show that the group index is greatly enhanced at the optimum value of the gain due to a dramatic amplification of the EIT-like resonance. Furthermore, a trade-off between the group index and the transmittance at the EIT-like resonance, which always exists in passive systems with no gains, can be removed at an approximate gain level. E-field enhancements are used to understand the underlying physics.
We propose a novel mechanism for generating electromagnetically induced transparency (EIT) in a symmetric metamaterial. The proposed metamaterial consists of double nanorod pairs, perpendicular to each other in the form of a 2-by-2 matrix. This metamaterial shows a polarization-independent EIT-like effect without breaking its symmetry. Since conventional plasmonic EIT metamaterials induce transparency in the transparent window through the coupling between the localized surface plasmon resonance modes, most of existing structures have asymmetric geometry. This limitation means the EIT-like effect can occur only under a particular linearly polarized incident light. The proposed structure, however, has a simple geometry and polarization independence, so it has the potential to be used in high sensitivity sensors and to slow light in the visible spectral range.
We propose a graphene metamaterial consisting of several layers of longitudinally separated graphene nanoribbon array embedded into gain-assisted medium, demonstrating electromagnetically induced transparency-like spectra. Combined with finite-difference time-domain simulations, the transfer matrix method and temporal coupled-mode theory are adopted to quantitatively describe its transmission characteristics. These transmission characteristics can be tuned by altering the gain level in medium layer and the Fermi energy level in graphene. Additionally, it is the incorporation between gain medium and graphene nanoribbons with optimized geometrical parameters and Fermi energy level that the destructive interference between high order graphene plasmonic modes can be obtained, suggesting drastic phase transition with giant group delay and ultra-high group index up to 180 ps and 104, respectively. Our results can achieve efficient slow light effects for better optical buffers and other nonlinear applications.
We report on our experimental work concerning a planar metamaterial exhibiting classical electromagnetically induced transparency (EIT). Using a structure with two mirrored split-ring resonators as the dark element and a cut wire as the radiative element, we demonstrate that an EIT-like resonance can be achieved without breaking the symmetry of the structure. The mirror symmetry of the metamaterial’s structural element results in a selection rule inhibiting magnetic dipole radiation for the dark element, and the increased quality factor leads to low absorption (<10%) and large group index (of the order of 30).
An analogy of electromagnetically induced transparency (EIT) based on all-dielectric metamaterial is theoretically demonstrated in this paper. The U-shaped Silicon-based metamaterial unit cell comprises a dipole antenna supported by one horizontal nanoscale bar and a quadrupolar antenna supported by two vertical nanoscale bars. The near-field coupling between the two antennas and the reduction of absorption loss lead to a narrow EIT-like transmission window with a high quality-factor of 130, which exhibits a refractive index sensitivity with a figure-of-merit of 29. The group delay of 0.75 ps and the group index of 2035 are obtained in the transmission window. Due to these unique optical properties, the proposed metamaterial structure can find many applications including slow-light devices, optical sensors, enhancement of non-linear processes, and storage of quantum information.